Using the pure premium ratemaking method with a five percent profit and contingencies factor, Insurer C$\text{'}$s pure premium is $$45.$ Its cost of issuing a policy and collecting the premium, is $$2\mathrm{.}50$ per car$-$year regardless of Insurer C$\text{'}$s premium size, rating class, or rating territory. Its other underwriting expenses such as commissions and premium tax, vary by premium size. Insurer C$\text{'}$s variable expense equal $10$ percent of the final premium. The rate per exposure unit rounded to the nearest dollar would be